Class: Mongo::Index::View

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain: self, Forwardable
Instance Chain: self, `::Mongo::Retryable`, Enumerable
Inherits:	Object
Defined in:	lib/mongo/index/view.rb

Overview

A class representing a view of indexes.

Since:

2.0.0

Constant Summary

KEY =

The index key field.
Since:
- 2.0.0
# File 'lib/mongo/index/view.rb', line 42
```
'key'.freeze
```
NAME =

The index name field.
Since:
- 2.0.0
# File 'lib/mongo/index/view.rb', line 47
```
'name'.freeze
```

OPTIONS =

The mappings of Ruby index options to server options.

Since:

2.0.0

# File 'lib/mongo/index/view.rb', line 52

{
  :background => :background,
  :bits => :bits,
  :bucket_size => :bucketSize,
  :default_language => :default_language,
  :expire_after => :expireAfterSeconds,
  :expire_after_seconds => :expireAfterSeconds,
  :key => :key,
  :language_override => :language_override,
  :max => :max,
  :min => :min,
  :name => :name,
  :partial_filter_expression => :partialFilterExpression,
  :sparse => :sparse,
  :sphere_version => :'2dsphereIndexVersion',
  :storage_engine => :storageEngine,
  :text_version => :textIndexVersion,
  :unique => :unique,
  :version => :v,
  :weights => :weights,
  :collation => :collation,
  :comment => :comment,
  :wildcard_projection => :wildcardProjection,
}.freeze

Class Method Summary

.new(collection, options = {}) ⇒ View constructor

Create the new index view.

Instance Method Summary

#create_many(*models) ⇒ Result

Creates multiple indexes on the collection.
#create_one(keys, options = {}) ⇒ Result

Creates an index on the collection.
#drop_all(options = {}) ⇒ Result

Drop all indexes on the collection.
#drop_one(name, options = {}) ⇒ Result

Drop an index by its name.
#each(&block)

Iterate over all indexes for the collection.
#get(keys_or_name) ⇒ Hash

Convenience method for getting index information by a specific name or spec.
#drop_by_name(name, comment: nil) private
#index_name(spec) private
#indexes_spec(session) private
#initial_query_op(session) private
#limit private
#normalize_keys(spec) private
#normalize_models(models, server) private
#send_initial_query(server, session) private

`::Mongo::Retryable` - Included

#read_worker	Returns the read worker for handling retryable reads.
#select_server	This is a separate method to make it possible for the test suite to assert that server selection is performed during retry attempts.
#write_worker	Returns the write worker for handling retryable writes.

Constructor Details

.new(collection, options = {}) ⇒ `View`

Create the new index view.

Examples:

Create the new index view.

View::Index.new(collection)

Parameters:

collection (Collection) —

The collection.
options (Hash) (defaults to: {}) —

::Mongo::Options for getting a list of indexes. Only relevant for when the listIndexes command is used with server versions >=2.8.

Options Hash (options):

:batch_size (Integer) —

The batch size for results returned from the listIndexes command.

Since:

2.0.0

[ GitHub ]

# File 'lib/mongo/index/view.rb', line 293


def initialize(collection, options = {})
  @collection = collection
  @batch_size = options[:batch_size]
  @options = options
end

Instance Attribute Details

#batch_size ⇒ `Integer` (readonly)

Returns:

(Integer) —

batch_size The size of the batch of results when sending the listIndexes command.

Since:

2.0.0

[ GitHub ]

# File 'lib/mongo/index/view.rb', line 34


attr_reader :batch_size

#collection ⇒ Collection (readonly)

Returns:

(Collection) —

collection The indexes collection.

Since:

2.0.0

[ GitHub ]

# File 'lib/mongo/index/view.rb', line 30


attr_reader :collection

Instance Method Details

#create_many(*models) ⇒ `Result`

Note:

On MongoDB 3.0.0 and higher, the indexes will be created in parallel on the server.

Creates multiple indexes on the collection.

Examples:

Create multiple indexes.

view.create_many([
  { key: { name: 1 }, unique: true },
  { key: { age: -1 }, background: true }
])

Create multiple indexes with options.

view.create_many(
  { key: { name: 1 }, unique: true },
  { key: { age: -1 }, background: true },
  { commit_quorum: 'majority' }
)

Parameters:

models (Array<Hash>) —
The index specifications. Each model MUST include a :key option, except for the last item in the Array, which may be a Hash specifying options relevant to the createIndexes operation. The following options are accepted:
- commit_quorum: Specify how many data-bearing members of a replica set, including the primary, must complete the index builds successfully before the primary marks the indexes as ready. Potential values are:
  - an integer from 0 to the number of members of the replica set
  - “majority” indicating that a majority of data bearing nodes must vote
  - “votingMembers” which means that all voting data bearing nodes must vote
- session: The session to use.
- comment: A user-provided comment to attach to this command.

Returns:

(Result) —

The result of the command.

Since:

2.0.0

[ GitHub ]

# File 'lib/mongo/index/view.rb', line 206


def create_many(*models)
  models = models.flatten
  options = {}
  if models && !models.last.key?(:key)
    options = models.pop
  end

  client.send(:with_session, @options.merge(options)) do |session|
    server = next_primary(nil, session)

    indexes = normalize_models(models, server)
    indexes.each do |index|
      if index[:bucketSize] || index['bucketSize']
        client.log_warn("Haystack indexes (bucketSize index option) are deprecated as of MongoDB 4.4")
      end
    end

    spec = {
      indexes: indexes,
      db_name: database.name,
      coll_name: collection.name,
      session: session,
      commit_quorum: options[:commit_quorum],
      write_concern: write_concern,
      comment: options[:comment],
    }

    Operation::CreateIndex.new(spec).execute(server, context: Operation::Context.new(client: client, session: session))
  end
end

#create_one(keys, options = {}) ⇒ `Result`

Note:

Note that the options listed may be subset of those available.

Creates an index on the collection.

See the MongoDB documentation for a full list of supported options by server version.

Examples:

Create a unique index on the collection.

view.create_one({ name: 1 }, { unique: true })

Parameters:

keys (Hash) —

A hash of field name/direction pairs.
options (Hash) (defaults to: {}) —

::Mongo::Options for this index.

Options Hash (options):

:unique (true, false) — default: false —

If true, this index will enforce a uniqueness constraint on that field.
:background (true, false) — default: false —

If true, the index will be built in the background (only available for server versions >= 1.3.2 )
:drop_dups (true, false) — default: false —

If creating a unique index on this collection, this option will keep the first document the database indexes and drop all subsequent documents with duplicate values on this field.
:bucket_size (Integer) — default: nil —

For use with geoHaystack indexes. Number of documents to group together within a certain proximity to a given longitude and latitude.
:max (Integer) — default: nil —

Specify the max latitude and longitude for a geo index.
:min (Integer) — default: nil —

Specify the min latitude and longitude for a geo index.
:partial_filter_expression (Hash) —

Specify a filter for a partial index.
:hidden (Boolean) —

When :hidden is true, this index will exist on the collection but not be used by the query planner when executing operations.
:commit_quorum (String | Integer) —
Specify how many data-bearing members of a replica set, including the primary, must complete the index builds successfully before the primary marks the indexes as ready. Potential values are:
- an integer from 0 to the number of members of the replica set
- “majority” indicating that a majority of data bearing nodes must vote
- “votingMembers” which means that all voting data bearing nodes must vote
:session (Session) —

The session to use for the operation.
:comment (Object) —

A user-provided comment to attach to this command.

Returns:

(Result) —

The response.

Since:

2.0.0

[ GitHub ]

# File 'lib/mongo/index/view.rb', line 157


def create_one(keys, options = {})
  options = options.dup

  create_options = {}
  if session = @options[:session]
    create_options[:session] = session
  end
  %i(commit_quorum session comment).each do |key|
    if value = options.delete(key)
      create_options[key] = value
    end
  end
  create_many({ key: keys }.merge(options), create_options)
end

#drop_all(options = {}) ⇒ `Result`

Drop all indexes on the collection.

Examples:

Drop all indexes on the collection.

view.drop_all

Parameters:

options (Hash) (defaults to: {}) —

::Mongo::Options for this operation.

Options Hash (options):

:comment (Object) —

A user-provided comment to attach to this command.

Returns:

(Result) —

The response.

Since:

2.0.0

[ GitHub ]

# File 'lib/mongo/index/view.rb', line 109


def drop_all(options = {})
  drop_by_name(Index::ALL, comment: options[:comment])
end

#drop_by_name(name, comment: nil) (private)

Since:

2.0.0

[ GitHub ]

# File 'lib/mongo/index/view.rb', line 301


def drop_by_name(name, comment: nil)
  client.send(:with_session, @options) do |session|
    spec = {
      db_name: database.name,
      coll_name: collection.name,
      index_name: name,
      session: session,
      write_concern: write_concern,
    }
    spec[:comment] = comment unless comment.nil?
    server = next_primary(nil, session)
    Operation::DropIndex.new(spec).execute(server, context: Operation::Context.new(client: client, session: session))
  end
end

#drop_one(name, options = {}) ⇒ `Result`

Drop an index by its name.

Examples:

Drop an index by its name.

view.drop_one('name_1')

Parameters:

name (String) —

The name of the index.
options (Hash) (defaults to: {}) —

::Mongo::Options for this operation.

Options Hash (options):

:comment (Object) —

A user-provided comment to attach to this command.

Returns:

(Result) —

The response.

Raises:

(Error::MultiIndexDrop)

Since:

2.0.0

[ GitHub ]

# File 'lib/mongo/index/view.rb', line 91


def drop_one(name, options = {})
  raise Error::MultiIndexDrop.new if name == Index::ALL
  drop_by_name(name, comment: options[:comment])
end

#each(&block)

Iterate over all indexes for the collection.

Examples:

Get all the indexes.

view.each do |index|
  ...
end

Since:

2.0.0

[ GitHub ]

# File 'lib/mongo/index/view.rb', line 265


def each(&block)
  session = client.send(:get_session, @options)
  cursor = read_with_retry_cursor(session, ServerSelector.primary, self) do |server|
    send_initial_query(server, session)
  end
  if block_given?
    cursor.each do |doc|
      yield doc
    end
  else
    cursor.to_enum
  end
end

#get(keys_or_name) ⇒ `Hash`

Convenience method for getting index information by a specific name or spec.

Examples:

Get index information by name.

view.get('name_1')

Get index information by the keys.

view.get(name: 1)

Parameters:

keys_or_name (Hash, String) —

The index name or spec.

Returns:

(Hash) —

The index information.

Since:

2.0.0

[ GitHub ]

# File 'lib/mongo/index/view.rb', line 251


def get(keys_or_name)
  find do |index|
    (index[NAME] == keys_or_name) || (index[KEY] == normalize_keys(keys_or_name))
  end
end

#index_name(spec) (private)

Since:

2.0.0

[ GitHub ]

# File 'lib/mongo/index/view.rb', line 316


def index_name(spec)
  spec.to_a.join('_')
end

#indexes_spec(session) (private)

Since:

2.0.0

[ GitHub ]

# File 'lib/mongo/index/view.rb', line 320


def indexes_spec(session)
  { selector: {
      listIndexes: collection.name,
      cursor: batch_size ? { batchSize: batch_size } : {} },
    coll_name: collection.name,
    db_name: database.name,
    session: session
  }
end

#initial_query_op(session) (private)

Since:

2.0.0

[ GitHub ]

# File 'lib/mongo/index/view.rb', line 330


def initial_query_op(session)
  Operation::Indexes.new(indexes_spec(session))
end

#limit (private)

Since:

2.0.0

[ GitHub ]

# File 'lib/mongo/index/view.rb', line 334


def limit; -1; end

#normalize_keys(spec) (private)

Since:

2.0.0

[ GitHub ]

# File 'lib/mongo/index/view.rb', line 336


def normalize_keys(spec)
  return false if spec.is_a?(String)
  Options::Mapper.transform_keys_to_strings(spec)
end

#normalize_models(models, server) (private)

Since:

2.0.0

[ GitHub ]

# File 'lib/mongo/index/view.rb', line 341


def normalize_models(models, server)
  models.map do |model|
    # Transform options first which gives us a mutable hash
    Options::Mapper.transform(model, OPTIONS).tap do |model|
      model[:name] ||= index_name(model.fetch(:key))
    end
  end
end

#send_initial_query(server, session) (private)

Since:

2.0.0

[ GitHub ]

# File 'lib/mongo/index/view.rb', line 350


def send_initial_query(server, session)
  initial_query_op(session).execute(server, context: Operation::Context.new(client: client, session: session))
end

Class: Mongo::Index::View

Overview

Constant Summary

Class Method Summary

Instance Attribute Summary

Instance Method Summary

::Mongo::Retryable - Included

Constructor Details

.new(collection, options = {}) ⇒ View

Instance Attribute Details

#batch_size ⇒ Integer (readonly)

#collection ⇒ Collection (readonly)

Instance Method Details

#create_many(*models) ⇒ Result

#create_one(keys, options = {}) ⇒ Result

#drop_all(options = {}) ⇒ Result

#drop_by_name(name, comment: nil) (private)

#drop_one(name, options = {}) ⇒ Result

#each(&block)

#get(keys_or_name) ⇒ Hash

#index_name(spec) (private)

#indexes_spec(session) (private)

#initial_query_op(session) (private)

#limit (private)

#normalize_keys(spec) (private)

#normalize_models(models, server) (private)

#send_initial_query(server, session) (private)

`::Mongo::Retryable` - Included

.new(collection, options = {}) ⇒ `View`

#batch_size ⇒ `Integer` (readonly)

#create_many(*models) ⇒ `Result`

#create_one(keys, options = {}) ⇒ `Result`

#drop_all(options = {}) ⇒ `Result`

#drop_one(name, options = {}) ⇒ `Result`

#get(keys_or_name) ⇒ `Hash`